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Search: id:A093339
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| A093339 |
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Middle digits of primes with an odd number of digits. |
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+0
3
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| 2, 3, 5, 7, 0, 0, 0, 0, 1, 2, 3, 3, 3, 4, 5, 5, 6, 6, 7, 7, 8, 9, 9, 9, 9, 1, 2, 2, 2, 3, 3, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 0, 1, 1, 1, 3, 3, 4, 4, 5, 5, 6, 7, 7, 8, 8, 9, 0, 0, 1, 2, 3, 3, 3, 4, 4, 5, 6, 6, 6, 7, 8, 9, 9, 0, 0, 2, 2, 4, 4, 5, 6, 6, 7, 7, 8, 9, 9, 0, 0, 1, 1, 1, 3, 4, 4, 4, 5, 5, 6, 7, 7, 8, 9, 0
(list; graph; listen)
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OFFSET
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2,1
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PROGRAM
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(PARI) midd(n) = { forprime(x=2, n, s = Str(x); ln = length(s); if(ln<2, p=1, p = (ln-1)/2+1); if(ln%2, md = eval(mid(s, p, 1)); print1(md", ") ) ) } \ Get a substring of length n from string str starting at position s in str. mid(str, s, n) = { v =""; tmp = Vec(str); ln=length(tmp); for(x=s, s+n-1, v=concat(v, tmp[x]); ); return(v) }
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CROSSREFS
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Cf. A077648, A007652.
Sequence in context: A131599 A076384 A124648 this_sequence A113566 A020775 A041000
Adjacent sequences: A093336 A093337 A093338 this_sequence A093340 A093341 A093342
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KEYWORD
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base,nonn
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AUTHOR
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Cino Hilliard (hillcino368(AT)gmail.com), Apr 25 2004
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